Glenwood Canyon to the west of Denver. The Colorado River flows through the canyon on its way south. I also saw an AMTRAK train and had and would travel through the valley by AMTRAK on this and susequent visits to the States.
The blurred people you can see had the camera that I wasn't using for this photo so we had an interesting chat about the good points of the Panasonic FZ 10/20. This was before the FZ30 and then FZ50 came out I was using my Nikon 5700 for infra-red as the Panasonic has too strong an ir cutting filter to be satisfactory.